Damper regulator



May 29, 1928. 1,671,892

C. H. DUTCHER DAMPER REGULATOR Filed July 17, 1926 2 Sheets-Sheet '1 INVENTOR hkf 0061M UharZesEDuTcher BY W94 ATTORNEYS WITNESSES 70 May 29, 1928. 1,671,892

. 1 c. H. DUTCHER DAMPER REGULATOR Filed July 17, 1926 ZSheets-Sheet 2 M i 36K 64 y/ l 45 WM INVENTOR QM c za'r eajipultker ATTORNEYS Patented May a9, 1928.

warren stares PATENT orrica.

CHARLES 1H. BUTCHER, or JnRsnYoITY, NEW JERSEYQASSIGNORATO .KIELEY & MUELLER, INC., on NEW YORK, N. Y., A CORPORATION OF NEW YORK.

namrnn REGULATOR.

Application filed July 17, 1926. Serial No. 123,243.

This invention relates to automatic damper regulators and has particular reference to an improvement in hydraulic regulators especially designed for automatically controlling the dampers of boiler lines of low pressure systems whereby'the dampers areent invention is to provide a hydraulic regulator-which graduallyv opens or closesv the damper relative to the pressure in the boiler so as to eliminate the common practice of r instantly moving the damper from a fully closed to a fully open position, or vice versa. v

Another object of the invention resides in the provision of an improved controlling valve for introducing the hydraulic'pressure to. the piston cylinder and cutting off and relieving said pressure through a single port and in making the valve bushing and plunger readily removable and renewable at a r minimum expense and Without undue loss of time. I

Another feature of the invention is embodied in the provision of a'counterbalancing device for the pressure-operated scale beam which permitsthe regulator to operate.

on extremely lowpressures, such as vapor systems.

The invention furthermore comprehends a damper regulator which is comparatively simple in its general construction, inexpen sive to manufacture and install, and which is thoroughly reliable and highly efficient in its purpose.

lVith the above recited and other objects in view, reference is had to the following specification and accompanying drawingsin which there'is exhibited one example or em bodiment of the invention whichis in no way intended as a limitation upon the scope r of the appended claim as it is to be clearly understood that variations and modifications which properly fall withinthe scope of said claim may be resorted to when found expedient.

In the drawings Figure '1 is a vertical sectional View through the regulator ton cylinder Fig. 4 is a fragmentarysectionalflplan View taken approximately on the line H of Fig.3;

Referring to the drawings of characters of reference, 10 designates a supporting V bracket upon which" a pressure chamber 11 is mounted, having a movable diaphragm 12,flGX8d by the boiler pressure which is led to the chamber through a pipe or conduit 13. Thebracket also supports a hollow base 14, within which the inner end of a scale beam 15 is fulcrumed at 16. The diaphragm 12 on its upper outer face is provided with means 17 engaging under the scale beam'vfor lifting or lowering the'outer free'end 718' ofthe same as the boilerpressure respectively lncreases or decreases. The outer freeend of the scale beam 15 is adapted to support a weight or weights 19 in accord ance with the pressure which it is desired to carry 1n the boiler. Supported upon'and extending upwardly from the base 14', is a cylinder20 having a spaced concentric "in ner -sleeve"21 and defining between the cylinder and said' sleeve a water-receiving chamber 22.. The upper end of thecylinder is closedby a head 23 and the upper end of the inner sleeve 21is open and spaced below the head 23 to allow for communication bet-ween the water chamber 22 and the interior of the cylinder. A hydraulic regulator piston 24 is mounted within the cylinder for vertical movement and V. the piston rod 25' thereof extends upwardlythrough a stuffing box 26 in the head 23. The upper end of the piston rod 25 is provided with an eye 27 connected by a chain or other flexible elepivoted in the boiler flue 31. The arm 29 supports at its free end a suitable weight or weights 32 and the'fiexible element is ,trained'over guide elements 3.3. A'hydraument 28 with the arm 29 of the damper 3O casing. The lever 61 is pivotally connected cates with the water chamber 22 and the interior oi": the valve casing 34. The valve casing is provided with a closed lower end 37, a lower bore 38 of less diameter than an intermediate bore 39, which intermediate bore is oil less diameter than the upper bore 40. A tubular bushing 41 having a: reduced lower diameter'42, a relatively larger intermediatediameter 42), and a major upper, diameter 44, is positioned in the valve casing and is provided with a tapered threaded portion 45 engaging a complementarytapered threaded portion 46 in the valve casing. The lower reduced diameter 42 is less than the diameter of the lower bore 38, the intermediate diameter 43 of the bushing is less than the diameter of the intermediate bore 89, andthe major. diameter 44 of the bushing is less thanthe diameter of the upper bore 40 of the casing. The bushing is provided with an axial bore 47 and extending radially outward therefrom and through the respectivediameters 42, 43 and 44 are ports 48,

49 and 50. A plunger valve 51 is axially movable in the axial borc of the bushing and the same is provided with a central portion 52 0t less diameter than the bore 47 and end portions 58 and 54 of approximately thesame diameter as the bore 47, the

portions 53 and 54 being spaced apart'a dis tance less than the axial spacing of the radial ports -48 and so that when the ports 50 are opened, the ports 48 are closed, and

vice ve'rsa, upon axial shitting movement of the plunger valves. The upper end of the plunger valve is detachably connected by'a coupling 55, with an actuator rod 56, which extends through a stufling box 57 in the valve casing cap 58. A hydraulic pressure conduit or pipe 59 leadsintothe upper compartme'nt or here 4001 the valve casing; and an outlet conduit or pipe 60 leads from the lower compartnientor bore 48 of said valve at 62 to the upperend plunger valve actuator, rod 56, and one extremity of said lever is pivotally connected at 63 to a connecting rod64 which in turn pivotally connected at 65 to the scale beam'15, The opposite extremity of the lever 61'is pivotally connected at 66 to a connecting bar 67,

whiclncon'necting bar in turn is pivotally connected at 68 to, the arm 69 0st compensating lever 7 O. The compensating lever is s tulcrumed at 71 on a bracket'72 carried by the stem 35. The fulcrum 71 is e'ccentric to thepivotal connection 68 between the arm 69 and connecting bar- 67. The compensating lever at its free end, is connected by a chain or flexible, connecting element 73 to a collar 74 secured on the piston rod 25. In order to counterbalance the weight of the scale beam 15, especially where the device is to be used on low pressure or vapor systems, a counterbalancing weight 75 is tulcrumed at 76 to a bracket arm 77 and is provided with an pressure which is desired, the regulator or piston 24will be disposed at the upper end of its stroke or approximately in the position illustrated in Figs. 1 and 2, the damper 3O inthe flue being fully opened as shown. When the pressure in' the boiler reaches the point which overcomes the weight of the scale beam, the pressure'upon the diaphragm I creates anupward force'to move the. scale .beam up. The movement of the, scale beamup opens the hydraulic valve by shifting the plunger 51 upwardly to substantially the position illustrated inFig. 3,at which point the hydraulic pressureiis admitted through the ports 50 between the valve heads 53 and 54, thence through the'ports 49 to the here or port 36 of the/stem 35. The hydraulic pressure flows through the stem filling up around the sleeve 21and thence to the upper side of theihydraulic piston 24 to causethe same to start on its downward stroke. As

the piston movesdown the compensatinglev ver 7 0, which is weighted at 80 adjacent its outer end, gravitates downwardly as a slack, is produced in the chain or flexible element 7 3. The downward movement of the compensating lever causes the, arm 69 thereof connecting bar 67, a downward movement to move downwardly and exert, through the pluger 51 downwardly to cut off the hydraulie pressure without opening the port 48 to the outlet pipe. The valve remains in this position until slightly more pressure is exerted on the d aphragm for causing the valve to open by the scale beam action. I

These operations are continued in succession until the regulatlon of the pressurefhas reached a definite predetermined point. In

opening the damper, the action is reversed.

WVhat is claimed is: 1 .Anautomatic draft regulator'for. steam boilers, including a weighted beam arm, a diaphragm operable by the steam pressure.

in the boilervfor moving the beam arm, a

piston cylinder, a piston mounted in the cylinder having operative connection withwthe damper of the boiler flue, a hydraulic pressure valve connected withv the cylinder, said valve having a hydraulic pressure intake and exhaust'and a shiftable vali e plunger in said intake movable to position for respectively admitting hydraulic pressure to and exhausting said pressure from the cyl inder at one side of the piston and for closing both the intake and exhaustto render the valve inactive, an actuating lever connected with the valve plungertor shitting;

the same, a connection between one end of the actuating lever and the beam arm for shifting the valve to admit hydraulic pressure to and exhaust said pressure from the cylinder, and a connection between the opposite end of said lever and the piston for rendering the valve inactive, the said hydraulic pressure valve having a lower portion of reduced diameter provided with an internal thread, a valve plunger bushing having a complementary external thread to facilitate the removal and renewal of the same whenworn.

' CHARLES H. DUTCHER. 

